The oldest fossil records date back about
a) 100 years.
b) 6 thousand years.
c) 2 million years.
d) 3500 million years.
d
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What causes the geological activity seen on some of the inner moons of Jupiter?
a. Constant collisions with space debris provide a power source for geological activity. b. The strong magnetic field of Jupiter heats the surface of the inner moons. c. Tidal friction as a result of being so close Jupiter heats their interiors. d. Solar radiation reflected of Jupiter's surface provides a power source for geological activity.
Why is the nightside of Mercury so much colder (relatively speaking) than the dayside?
A. Mercury is in synchronous rotation, so the far side of Mercury never sees the Sun. B. Mercury's lack of an atmosphere keeps the planet from retaining its surface heat. C. Mercury's small size lets it cool quickly. D. Mercury's magnetic field acts like a blanket on the planet's dayside.
The force between two quarks increases with separation
Indicate whether the statement is true or false
Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied forces P1/P2 5 5/2, the ratio of the joint C lateral deflections ?C1/?C2 is approximately:
(A) 1/2
(B) 4/5
(C) 3/2
(D) 2
